About NDT Studio

60+Apps published

10M+Total downloads

40+Languages covered

2012Founded

Who we are

NDT Studio is a one-person software studio based in Hanoi, Vietnam, run by developer Nhu Dinh Tao. It has been publishing mobile apps continuously since 2012 — first on Google Play, later on the App Store — and the catalogue has grown to more than sixty titles used by over ten million people.

There is no team, no investors, and no growth target. Apps get built because they are useful, and they get maintained because people rely on them.

What we build

The catalogue splits into two halves:

Offline bilingual dictionaries — 45 language pairs, from widely spoken languages like Spanish, Japanese and Arabic through to Cheyenne, Ojibwe, Mizo and Hakha Chin, which few publishers cover at all.
Small utilities — single-purpose tools such as Turn Off Screen, Voice Recorder, BMI Calculator, PDF Shot and PDFAmora.

You can browse everything on the full app catalogue.

Why offline matters

Every dictionary we publish works with the plane in airplane mode. That is a deliberate constraint, and it shapes the whole catalogue:

No connection required. Dictionary data ships inside the app. It works on a mountain, on a plane, and on a prepaid SIM with no data left.
No account. Nothing to sign up for, nothing to log into.
No lookups leave your device. A word you search is not a query sent to a server.
Small and fast. The apps are built to run on inexpensive, older phones, because that is what many of our users have.

About this blog

We write about practical language learning — studying Japanese through anime and manga, learning Korean through music, getting more out of an offline dictionary — plus guides and release notes for our own apps.

A note on our archive. Through the first half of 2026 a large part of this blog was produced from article templates. That content did not meet the standard we want for readers, and in August 2026 we removed it. What remains is written by hand, and that is how we intend to keep it.

Where to find our apps

Contact

Bug reports, feature requests, dictionary corrections and licensing questions all go to the same place: support@ndtstudio.com, or through the support form. Messages are read by the person who wrote the app.

Corrections to dictionary entries are especially welcome — for the smaller languages in the catalogue, reader corrections are often the best source we have.